US4521479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment for tack reduction of elastomer surfaces
Assignee: Bridgestone Firestone Inc
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Filing: 1983-05-26
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Granted: 1985-06-04
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Expires: 2003-05-26
Abstract
Abstract A method for reducing the surface tack of EPDM and related elastomers is provided. The method involves coating the surfaces of the elastomer with particulate cellulose. Sheets of cellulose coated elastomer can be subjected to rolling up and curing operations without encountering surface sticking problems. In addition, the cellulose coated surfaces of the elastomer can be bonded together for the purpose of forming splices or seams without the necessity for first removing the cellulose coating.
Inventors
- 👤 Ralph A. Maglio
- 👤 John W. Fieldhouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:25
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/16; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08L1/00; C08J2323/00; C08J2323/02; C08J2323/16; C08J2401/00; C08L2312/00; C08L2666/00; C08L2666/02; C08L2666/26; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/31504; Y10T428/31855; Y10T428/3188
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
23 words
A method of reducing the surface tack of an EPDM elastomer which comprises coating the surfaces of the EPDM elastomer with particulate cellulose.
Claim 2
Independent Claim
23 words
A method of reducing the surface tack of an EPDM elastomer which comprises coating the surfaces of the EPDM elastomer with particulate cellulose.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said particulate cellulose has a particle size which will enable it to pass through a number 200 mesh screen.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein said EPDM elastomer is coated by dusting or brushing.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein said EPDM elastomer is coated by passing a sheet of the elastomer through a container filled with particulate cellulose.
Claim 6
Dependent Claim
13 words
An article comprising an EPDM elastomer having its surfaces coated with particulate cellulose.
Claim 7
Dependent Claim
13 words
An article comprising an EPDM elastomer having its surfaces coated with particulate cellulose.
Claim 8
Dependent Claim
16 words
The article of claim 5 wherein said EPDM elastomer is in the form of a sheet.
Claim 9
Dependent Claim
16 words
The article of claim 5 wherein said EPDM elastomer is in the form of a roll.
Claim 10
Dependent Claim
13 words
The article of claim 5 wherein said EPDM elastomer is cured or uncured.
References Cited (Backward Citations)
US3592725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |